Make My Link the P-link
Simon hit on plinks as an echo to Tim Bray's comments and variation on Purple Numbers (Purple Numbers as a reference). As I have mentioned before, page numbers fail us and these steps are a good means to move forward.
Simom has also posted in more plinks and in there points to Chris Dent's Big Day for Purple Numbers.
I have been thinking for quite some time about using an id attribute in each paragraph tag that includes the site permalink as well as the paragraph with in that entry. This would look like: <p id="1224p7">. This signifies permanent entry 1224 and paragraph 7 with in that entry. What I had not sorted out was an unobtrusive means of displaying this. I am now thinking about Simon's javascript as a means of doing this. The identifier and plink would be generated by PHP for the paragraph tag, which would be scraped by the javascript to generate the plink.
The downside I see is only making edits at the end of the entry using the "Update" method of providing edits and editorial comments. The other downside is the JavaScript is not usable on all mobile devices, nor was the speed of scrolling down Simon's page that fluid in Safari on my TiBook with 16MB of video RAM.